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Manual conversion is your best bet, as well as bigger free flowing exhaust. Once you've done those two, THEN lean it out with 2 clicks on the AFM. Doing it before manual/exhaust IMO is just a waste of time.

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Remove the cover on the top of the AFM, there you will see a wheel where there is a screw you can remove to adjust the wheel, hold the wheel while the screw is being undone, then adjust it. Just make sure you mark where you wheel is in the first place.

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Pretty sure that is the one. It should be easy to figure out which way the spring tension is, what you want to do is make it more tense.

If you want to do it the safe and proper way, get a device that allows you to modify the Airflow signals across different throttle and rev points, and get it tuned on the dyno something like the Jaycar fuel adjuster or SAFC2

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I've used a Apexi S-AFC Dial type to lean out and play around with the fuel curve, Its simple and effective.
Very easy to use and has been a great point to start off with.
I've got the dip switch settings and the car selector type if anyone is interested as the instructions in the Apexi manual wasn't correct (it didnt work for me with my 1G setup).
you can pick these up fairly cheap from yahoo japan and ebay from time to time.